KR20030043940A - Image exposure recorder and image exposure recording method - Google Patents

Abstract

The present invention is an image exposure recording apparatus for exposing and recording a holographic stereogram image or a hologram image on a recording medium for a hologram, wherein the polarization plane of the reference light R is rotated by the half wave plate 11, and the reference light R Is incident on the hologram recording medium 3 and the intensity of the reference light R transmitted through the polarizing plate 12 is measured by the photodetector 13 of the reference light R passing through a partial region of the hologram recording medium. Equipped with a back calibration system The inverse correction system is caused by the object light and the reference light passing through the recording medium for hologram having birefringence by determining the rotation angle of the half-wave plate so that the intensity of the reference light R detected by the photodetector is minimum or maximum. A holographic stereogram in which a bright holographic stereogram image is reproduced is produced by avoiding a decrease in the interference between the object light and the reference light.

Description

Image exposure recorder and image exposure recording method

A holographic stereogram is, for example, a large number of images obtained by sequentially photographing a subject from different viewpoints, and these are arranged in a single shape (a brush state) or contact with a single hologram recording medium. It is produced by sequentially recording exposure as an element hologram of the form.

For example, a holographic stereogram having parallax information only in the lateral direction, as illustrated in FIG. 17, shows a plurality of originals 101a to 101e obtained by sequentially photographing a subject 100 from different viewing points in the lateral direction. Interference arcs (stripes) caused by interference between the object light and the irradiated light, which are image-modulated by sequentially displaying them on a display in a holographic stereogram production apparatus having a predetermined optical system and irradiating the displayed image with laser light. Is produced by sequentially exposing the recording medium 102 to the hologram recording medium 102 as a single element element hologram.

In the holographic stereogram produced in this way, since image information obtained by sequentially photographing from different viewpoints in the lateral direction is recorded sequentially in the lateral direction as a single element hologram, the observer sees this from one position. In this case, an aggregate of image information recorded as part of each element hologram is identified as a two-dimensional image. When one eye sees from another position different from this position, the collection of image information recorded as another part of each element hologram is identified as another two-dimensional image. Therefore, in the holographic stereogram, when an observer sees this with both eyes, the exposure recording image is recognized as a three-dimensional image by the parallax of the left and right eyes.

Examples of applications using such holographic stereograms include, for example, "Akira Shirakura, Nobuhiro Kihara and Shigeyuki Baba," Instant holographic portrait printing system ", Proceeding of SPIE, Vol. 3293, pp. 246-253, Jan. A photographing apparatus for photographing a subject and generating a parallax image sequence, as described in 1998, "High Speed Hologram Portrait Printing System", 3D Image Conference 1998, July 1998, etc. A holographic stereogram, such as a holographic stereogram production apparatus, or a printer system incorporating a printing apparatus for outputting a hologram as a printed matter. Such a printer system can provide a service from photographing a subject to printing of photographing results at the same place.

When the holographic stereogram described above is produced, as shown in Fig. 18, the photopolymer layer 202 made of a photopolymerizable photopolymer is a base film 201 and a cover film as the recording medium 200 for the hologram. A so-called film-coated recording medium formed by being sandwiched is used. As described above, the holographic recording medium 200 in the form of a film having a multi-layer structure does not need to replace the photopolymer layer 202 with glass or the like when the holographic stereogram is produced, and thus can be recorded as it is. Excellent handling convenience.

As the base film 201 and the cover film 203 in the hologram recording medium 200, a polyethylene terephthalate (hereinafter referred to as PET) film is mainly used. This is due to various requirements in the process of manufacturing the hologram recording medium 200. Specifically, in the hologram recording medium 200, chemical resistance in the process of applying the photopolymer layer 202 is required for the base film 201 and the cover film 203, and also the photopolymer. The layer 202 and the dye, the sensitizer and the like contained in the photopolymer layer 202 are required to cause no reaction, diffusion, or the like. For this reason, in the hologram recording medium 200, PET film is used as a film meeting these requirements. In addition, about this, the applicant was verified by the comparative experiment about the recording medium for holograms using the film of a different material as a base film and a cover film.

Here, it is known that the holographic stereogram causes unevenness in the brightness of the holographic stereogram image exposed and recorded by the hologram recording medium 200 to be used. As one of the causes, when producing a holographic stereogram, the coherence of the laser beam irradiated onto the hologram recording medium 200 is considered. As a factor influencing this coherence, the birefringence by the base film 201 and the cover film 203 in the hologram recording medium 200 is considered. That is, although the PET film mentioned above is a film which has a birefringence, it is considered that due to the birefringence by this PET film, the bad influence on the coherence of a laser beam is affected.

19 shows the concept of birefringence by PET film. For example, as indicated by the arrow aa in the same figure, the incident direction of light waves having a linear polarization is affected by birefringence when passing through the PET film PF. Therefore, the emitted light E having passed through the PET film PF generally has an elliptical polarization in the polarization state, as indicated by the arrow bb in the same drawing as the vibration direction of the light wave. In addition, since the state of the elliptical polarization in the emitted light E is different depending on the thickness of the PET film PF, the manufacturing method, the cutting direction, etc., it is difficult to produce the PET film PF uniformly with high accuracy. Do. Note that the state of the elliptical polarization in the emitted light E is also different depending on the polarization angle of the linearly polarized light in the incident light I.

The brightness of the holographic stereogram image is determined not only because of the refractive index modulation degree or thickness of the hologram recording medium 200, but also by vibrations applied from the outside during exposure recording or as described above. It also depends on the coherence of the laser light irradiated onto the recording medium 200. The coherence of the laser light is influenced by the polarization state between the object light and the irradiation light, such as the interference distance of the laser light source to be used. Among these, about the polarization state between the object light and the reference light, ideally, as shown in Fig. 20, the object light O and the reference light R irradiated to the hologram recording medium 200 are indicated by arrows ( cc and dd), it is preferable that linear polarization in the same direction is preferable, and in particular, when reference light R is S polarization, coherence becomes the highest. In addition, in the polarization state between the object light O and the reference light R, in the layer in which the holographic stereogram is actually recorded, that is, in the photopolymer layer 202 in the hologram recording medium 200, It should be noted that the object light O and the reference light R need to be linearly polarized light.

However, in the hologram recording medium 200 having a multilayer structure shown in FIG. 18, for example, the hologram recording medium 200 is formed by birefringence by the base film 201 and the cover film 203 made of PET film. Even if the object light and the reference light incident on each other are linear S polarized together, the linear S polarized light is not obtained at the stage of reaching the photopolymer layer 202.

As described above, in the holographic stereogram, due to the birefringence by the base film 201 and the cover film 203, the polarization state originally possessed by the object light and the reference light is changed, thereby adversely affecting the coherence, and as a result, There is a situation that the holographic stereogram image to be recorded exposure becomes dark.

The present invention relates to an image exposure recording apparatus and an image exposure recording method for exposing and recording a holographic stereogram image or a hologram image to a recording medium for a hologram.

Fig. 1 is a cross-sectional view showing the main parts of a hologram recording medium used in the holographic stereogram manufacturing apparatus to which the present invention is applied.

2A to 2C are views for explaining the photosensitive process of the recording medium for hologram according to the present invention, FIG. 2A shows an initial state, FIG. 2B shows an exposure state, and FIG. 2C shows a mounting state. .

3 is a conceptual diagram illustrating the polarization state of the object light incident on the hologram recording medium and the reference light when the cover film of the hologram recording medium is peeled off and recorded.

Fig. 4 is a conceptual diagram illustrating the polarization state of the object light and the reference light when the cover film is peeled off and recorded on the hologram recording medium.

5A to 5C are conceptual views illustrating polarization planes of the object light and the reference light for explaining reverse correction performed by tilting the polarization plane of the reference light in advance, and FIG. 5A is a view illustrating the reference light incident on the recording medium for the same hologram. 5B shows the polarization plane of the reference light on the photopolymer layer in the hologram recording medium, and FIG. 5C shows the polarization plane of the object light on the photopolymer layer.

FIG. 6 is a view for explaining the configuration of a reverse correction system for performing reverse correction described in FIGS. 5A to 5C.

FIG. 7 is a view for explaining the overall configuration of the holographic stereogram production apparatus to which the inverse correction system shown in FIG. 6 is applied.

8A and 8B are views illustrating an optical system of a holographic stereogram production apparatus to which the present invention is applied, and FIG. 8A is a front view of an optical system of a holographic stereogram production apparatus, and FIG. 8B is an optical system of a holographic stereo production apparatus. Top view of the.

9A to 9C are schematic diagrams illustrating the rotational direction of the same hologram recording medium and the polarization planes of the object light and the reference light for explaining reverse correction performed by rotating the hologram recording medium, and FIG. 9A is a hologram recording medium. 9B shows the polarization plane of the reference light on the photopolymer layer in the hologram recording medium, and FIG. 9C shows the polarization plane of the object light on the photopolymer layer.

FIG. 10 is a diagram for explaining the configuration of a reverse correction system for performing reverse correction described in FIGS. 9A and 9C.

FIG. 11 is a view for explaining the overall configuration of the holographic stereogram production apparatus to which the inverse correction system shown in FIG. 10 is applied.

12A and 12B are views illustrating an optical system of the holographic stereogram production apparatus, FIG. 12A is a front view of an optical system of the holographic stereogram production apparatus, and FIG. 12B is a plan view of the optical system of the same holographic stereogram production apparatus. to be.

Fig. 13 is a flowchart for explaining a series of steps when performing conditional exposure exposure recording in a holographic stereogram production apparatus.

Fig. 14 is a front view of a holographic stereogram produced by conditional exposure recording.

15 is a diagram for explaining the configuration of a reverse correction system in the copying apparatus.

Fig. 16 is a front view of a hologram produced by conditional exposure recording.

17 is a diagram for explaining a method of manufacturing a general holographic stereogram.

18 is a sectional view showing the principal parts of a general hologram recording medium.

19 is a conceptual diagram illustrating birefringence by a PET film.

FIG. 20 is a conceptual diagram illustrating a polarization state of an object light and a reference light incident on a general hologram recording medium.

The present invention has been proposed in view of the above-described circumstances, and an object thereof is to reduce the interference of the object light and the reference light due to the transmission of the object light and the reference light for the hologram recording medium having birefringence. Provided are an image exposure recording apparatus and an image exposure recording method capable of avoiding, deriving an optimal coherence in producing a holographic stereogram or a hologram, and eliminating instability of brightness of a holographic stereogram image or a hologram image. It's there.

SUMMARY OF THE INVENTION The present invention proposed to achieve the above object is an image exposure recording apparatus for exposing and recording a holographic stereogram image or a hologram image on a recording medium for a hologram, wherein a laser beam is applied to an object light and a reference light for the recording medium for a hologram. Exposure recording means for irradiating and recording a holographic stereogram image or a hologram image by exposure, polarization state detection means for detecting a polarization state of laser light transmitted through the hologram recording medium, and a recording layer in the hologram recording medium A polarization state varying means for varying the polarization state of the laser light incident on the recording medium for the hologram based on the detection result by the polarization state detection means so as to have the highest interference between the object light and the reference light on the image.

The image exposure recording apparatus according to the present invention detects the polarization state of the laser beam transmitted through the hologram recording medium by the polarization state detection means when the exposure recording means records the holographic stereogram image or the hologram image. On the basis of the detection result by the polarization state detection means, by changing the polarization state of the laser light by the polarization state variable means, and increasing the interference between the object light and the reference light on the recording layer in the recording medium for the hologram, A holographic stereogram or hologram in which a bright holographic stereogram image is reproduced can be produced while avoiding a decrease in the interference between the object light and the reference light caused by the transmission of the object light and the reference light for the hologram recording medium having birefringence.

An image exposure recording method according to the present invention is an image exposure recording method for exposing and recording a holographic stereogram image or a hologram image to a hologram recording medium, and irradiating laser light to the hologram recording medium as object light and reference light. A polarization state detection step of detecting a polarization state of a laser beam transmitted through a hologram recording medium when the holographic stereogram image or a hologram image is exposed and recorded, an object light and a reference light on the recording layer in the hologram recording medium The polarization state varying step of changing the polarization state of the laser beam incident on the recording medium for the hologram is provided on the basis of the detection result in the polarization state detection step so that the interference with the highest.

The image exposure recording method according to the present invention detects the polarization state of the laser beam transmitted through the recording medium for hologram when the holographic stereogram image or the hologram image is exposed and recorded, and based on the detection result, the polarization of the laser beam By changing the state and increasing the coherence between the object light and the reference light on the recording layer in the recording medium for the hologram, the object light and the reference light resulting from the transmission of the hologram recording medium having the birefringence It is possible to produce a holographic stereogram or hologram in which a bright holographic stereogram image or a hologram image is reproduced, by avoiding the deterioration of the coherence.

Further, the image exposure recording apparatus according to the present invention is an image exposure recording apparatus for exposing and recording a holographic stereogram image or a hologram image on a recording medium for a hologram, and using laser light as an object light and a reference light for the recording match for the hologram. On the recording layer in the hologram recording medium; exposure recording means for irradiating and exposing and recording a holographic stereogram image or hologram image; and polarization state detection means for detecting the polarization state of the laser beam transmitted through the hologram recording medium; The recording medium rotating means for rotating the recording medium for the hologram on the basis of the detection result by the polarization state detecting means so as to have the highest interference between the object light and the reference light.

The image exposure recording apparatus according to the present invention detects the polarization state of the laser beam transmitted through the hologram recording medium by the polarization state detection means when the exposure recording means records the holographic stereogram image or the hologram image. By rotating the recording medium for the hologram by the recording medium rotating means on the basis of the detection result by the polarization state detecting means, and increasing the interference between the object light and the reference light on the recording layer in the recording medium for the hologram, It is possible to produce a bright holographic stereogram image or a holographic stereogram in which a hologram image is reproduced, while avoiding a decrease in the interference between the object light and the reference light caused by projecting the hologram recording medium having the object light and the reference light having birefringence. have.

Further, the image exposure recording method according to the present invention is an image exposure recording method for exposing and recording a holographic stereo image or a hologram image to a hologram recording medium, wherein the laser light is applied to the hologram recording medium as object light and reference light. A polarization state detection step of detecting a polarization state of the laser beam transmitted through the hologram recording medium when irradiating and recording the holographic stereogram image or the hologram image, and the object light on the recording layer in the hologram recording medium And a recording medium rotating step of rotating the hologram recording medium on the basis of the detection result in the polarization state detecting step so as to have the highest interference with the reference light.

The image exposure recording method according to the present invention detects the polarization state of a laser beam that has passed through a hologram recording medium when recording a holographic stereogram image or a hologram image, and records holograms based on the detection result. By rotating the medium and increasing the interference between the object light and the reference light on the recording layer in the recording medium for the hologram, the object light and the reference light resulting from the transmission of the object medium and the reference light having the birefringence hologram recording medium It is possible to produce a holographic stereogram or a hologram in which a bright holographic stereogram image or a hologram image is reproduced, while avoiding a decrease in the coherence.

Moreover, the image exposure recording apparatus which concerns on this invention is an image exposure recording apparatus which exposes and records a holographic stereogram image or a hologram image on the recording medium for holograms, The laser beam is made into object light and a reference light with respect to the hologram recording device. Exposure recording means for irradiating and exposing and recording the holographic stereo image or hologram image; and polarization state varying means for changing the polarization state of the laser beam incident on the recording medium for the hologram, wherein the exposure recording means includes at least one or more pieces. For each exposure recording of a holographic stereo image or hologram image, conditional exposure exposure recording for determining the polarization state of the laser light so that the interference between the object light and the reference light on the recording layer in the hologram recording medium is the highest. The polarization state can be changed by state varying means. A plurality of conditionally calculating holographic stereogram images or hologram images are subjected to exposure recording, and the polarization state varying means includes the object light and the reference light detected on the basis of the plurality of condition calculating holographic stereogram images or hologram images. The polarization state of the laser beam is changed so that the polarization state of the laser beam having the highest interference with the laser beam is obtained.

The image exposure recording apparatus according to the present invention is a polarization state by conditional exposure exposure recording for determining the polarization state of laser light such that the coherence between the object light and the reference light on the recording layer in the hologram recording medium is the highest. The object detected by the exposure recording means is subjected to exposure recording of a plurality of conditional holographic stereogram images or hologram images for each change of? The polarization state of the laser light is changed by the polarization state variable means so that the polarization state of the laser light is obtained so that the interference between the light and the reference light is the highest, which is caused by the transmission of the object light and the reference light for the hologram recording medium of the birefringence. Avoiding degradation of the interference between the object light and the reference light It is possible to produce a holographic stereogram or hologram in which a graphic stereogram image or a hologram image is reproduced.

The image exposure recording method according to the present invention is an image exposure recording method for exposing and recording a holographic stereogram image or a hologram image on a recording medium for a hologram, and exposing at least one holographic stereogram image or holographic image. For each recording, the laser beam is irradiated onto the recording medium for the hologram with the object light and the reference light, and the polarization state of the laser light is determined so that the interference between the object light and the reference light on the recording layer of the recording medium for the hologram is high. Based on a condition calculation exposure recording step of exposing and recording a plurality of conditional holographic stereogram images or hologram images each time the polarization state is changed, and on the basis of a plurality of conditional holographic stereogram images or hologram images And the highest interference between the detected object light and the reference light Is obtained so that the laser light polarization state, equipped with the polarization state varying step to vary the laser beam polarized state.

The image exposure recording method according to the present invention is a polarization state by conditional exposure exposure recording for determining the polarization state of laser light so that the coherence between the object light and the reference light on the recording layer in the hologram recording medium is the highest. And recording the holographic stereogram image or the hologram image for conditional calculation for each change of the?, And the coherence between the object light and the reference light detected based on the holographic stereogram image or hologram image for the plurality of conditional calculation By changing the polarization state of the laser beam so that the polarization state of the laser beam is obtained so as to be the highest, the fall of the interference between the object light and the reference light due to the transmission of the object light and the reference light having the birefringent recording medium is avoided. , Bright holographic stereogram pictures or holographic pictures It is possible to produce holographic stereo or holograms.

Further, the image exposure recording apparatus according to the present invention is an image exposure recording apparatus for exposing and recording a holographic stereogram image or a hologram image to a hologram recording medium, wherein an object light and a reference light are applied to the hologram recording medium. And exposure recording means for irradiating and recording a holographic stereogram image or a hologram image by exposure, and a recording medium rotating means for rotating the recording medium for the hologram, wherein the exposure recording means includes at least one holographic stereogram image or For each exposure recording of the hologram image, conditional exposure exposure recording for determining the polarization state of the laser light so that the coherence between the object light and the reference light on the recording layer in the hologram recording medium is the highest. The plural number each time the hologram recording medium is rotated And recording the holographic stereogram image or the hologram image for the calculation condition of the recording medium, and the recording medium rotating means interfering with the detected object light and the reference light based on the holographic stereo image or hologram image for the plurality of condition calculation. The recording medium for the hologram is rotated so that the polarization state of the laser light is obtained so as to be the highest.

The image exposure recording apparatus according to the present invention is a holographic recording medium in which a holographic recording medium is subjected to conditional exposure exposure recording for determining the polarization state of a laser beam so that the interference between the object light and the reference light on the recording layer is the highest. A plurality of conditionally calculated holographic stereogram images or hologram images each time the recording medium is rotated are exposed by exposure recording means, and detected based on a plurality of conditionally calculated holographic stereogram images or hologram images. By rotating the hologram recording medium by the recording medium rotating means so that the polarization state of the laser light is obtained so that the coherence of the object light and the reference light is the highest, the object light and the reference light pass through the hologram recording medium having birefringence. Avoiding a decrease in the interference between the object light and the reference light caused by A holographic stereogram or hologram in which a bright holographic stereogram image or a holographic stereogram image is reproduced can be produced.

The image exposure recording method according to the present invention is an image exposure recording method for exposing and recording a holographic stereogram image or a hologram image to a hologram recording medium, and exposing at least one holographic stereogram image or hologram image. For each recording, the laser beam is irradiated to the recording medium for the hologram with the object light and the reference light, and the polarization state of the laser light is determined so that the interference between the object light and the reference light on the recording layer of the recording medium for the hologram is the highest. A holographic stereogram image or holographic image for exposure recording a plurality of condition calculations each time the hologram recording medium is rotated, and a holographic stereogram image or hologram image for a plurality of conditions. Interference between object light and reference light detected based on Is such that the highest of the laser light so that the polarization state is obtained, the recording medium equipped rotation step of rotating the recording medium for holograms.

The image exposure recording method according to the present invention is a holographic recording medium which is a condition-calculated exposure recording for determining the polarization state of a laser light in which interference between an object light and a reference light on a recording layer in a hologram recording medium becomes high. Exposure recording of a plurality of conditional holographic stereogram images or hologram images at the time of rotation, and interference between the object light and the reference light detected based on the plurality of conditional holographic stereogram images or hologram images By rotating the recording medium for the hologram so that the polarization state of the laser light is obtained to have the highest performance, the degradation of the interference between the object light and the reference light due to the transmission of the object light and the reference light for the hologram recording medium having birefringence is avoided. A bright holographic stereogram or holographic image It is possible to produce the resulting holographic stereogram or hologram.

Further objects of the present invention and specific advantages obtained by the present invention will become more apparent from the description of the embodiments described below with reference to the drawings.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment which applied this invention is described in detail, referring drawings.

The following example shows a holographic stereogram production apparatus for producing a holographic stereogram by sequentially exposing and recording an interference arc in the form of a single or a dot by means of an element hologram on a hologram recording medium made of a photosensitive film. will be.

The holographic stereogram manufacturing apparatus to which the present invention is applied prevents the degradation of the interference between the object light and the reference light due to the birefringence of the recording medium for the hologram, and produces a holographic stereogram in which a bright holographic stereogram image is reproduced. Can be.

First, prior to the description of the holographic stereogram production apparatus, the principle of exposure recording of element holograms for a recording medium for holograms will be described.

As shown in Fig. 1, the hologram recording medium 3 is a photopolymerizable photopolymer on a base film 4, which is a support material made of, for example, polyethylene terephthalate (hereinafter referred to as PET) film. A so-called film-coated recording medium in which a photopolymer layer 5, which is a recording layer, is formed, and a cover film 6, which is a support member made of, for example, PET film, is deposited on the photopolymer layer 5, for example. to be.

As shown in FIG. 2A, the hologram recording medium 3 includes a photopolymerizable photopolymer constituting the photopolymer layer 5, in which the monomer M is uniformly dispersed in the matrix polymer in an initial state. It is a state. In the photopolymerizable photopolymer, as the laser beam LA having a power of 10 m / cm 3 to 400 mJ / cm 3 is irradiated, as shown in FIG. 2B, the monomer M uniformly dispersed in the matrix polymer in the exposed portion is formed. The state of polymerization is polymerized.

As the photopolymerized photopolymer polymerizes, the monomer (M) moves from the surroundings, so that the modulation of the refractive index occurs in the exposed portion and the unexposed portion in the nonuniformity of the concentration of the monomer (M). As shown in FIG. 2C, the photopolymerizable photopolymer is irradiated with ultraviolet or visible light (LB) having a power of about 1000 mJ / cm 3 to the entire surface, thereby completing polymerization of the monomer (M) in the matrix polymer. In the hologram recording medium 3, the refractive index of the photopolymerizable photopolymer constituting the photopolymer layer 5 changes according to the incident laser light LA, resulting from interference between the object light and the reference light. The interference call is recorded as a change in refractive index.

The holographic stereogram production apparatus uses a film-coated recording medium composed of the photopolymer layer 5 by such a photopolymerizable photopolymer as the hologram recording medium 3, so that the recording medium for the hologram after exposure ( The process of performing special developing treatment in 3) becomes unnecessary. Therefore, the holographic stereogram production apparatus can simplify the configuration by eliminating the development apparatus and the like, and can also rapidly produce the holographic stereogram.

By the way, as one method for reducing the influence of the birefringence by the base film 4 and the cover film 6 in the recording medium 3 for holograms and improving the coherence between the object light and the reference light, It is contemplated that both the base film 4 and the cover film 6 are peeled off and subjected to exposure recording. This method exposes the photopolymer layer 5 to the outside as it is, and cannot be said to be a preferable method in terms of rigidity.

Therefore, as another method for reducing the influence of the birefringence by the base film 4 and the cover film 6 on the recording medium 3 for the hologram, at least among the base film 4 or the cover film 6 It is considered that one side is peeled off and the exposure is recorded. For example, as shown in FIG. 3, in the hologram recording medium 3, the main surface to which the reference light R is irradiated is the side of the base pile 4, and the main surface to which the object light 0 is irradiated is covered. The case where the cover film 6 is peeled off and the exposure is recorded on the side of the film 6 is considered. At this time, the object light O enters the hologram recording medium 3 at the same time as the polarization state becomes linearly polarized light as indicated by the arrow a in FIG. 3, and the reference light R Denotes the vibration direction of the light wave in arrow (b) in FIG. 3, the polarization state becomes a straight line S polarized light and is incident on the recording medium 3 for hologram.

In this case, the object light 0 whose polarization state becomes linearly polarized light is not affected by birefringence, as shown in FIG. 4, and as shown by the arrow a 'in FIG. In incident on the photopolymer layer 5 with the state preserved, no problem occurs. On the other hand, with respect to the reference light R, although the polarization state becomes a straight line S polarization and is incident on the base film 4, as shown by the arrow b 'in FIG. 4), the base film 4 is changed to elliptical polarization under the influence of birefringence, and is separated from the above-mentioned polarization state. When the applicant of this application tested the state of the stagger | deviation from the linearly polarized light of this reference light R, it was confirmed that the dependence on the base film is large. That is, the polarization state of the reference light (R) is the base film (4), when using a thickness of 50 micrometers, for example, the installation angle of the base film (4) to the reference light (R) to be irradiated 1 Even if it was inclined about a degree, it greatly changed, and also the big change in the coherence with the object light (O) was confirmed. In other words, even in the case where the selection of the base film 4 is enjoyed and an attempt is made to reduce the influence of birefringence, the selection criteria become unrealistically strict. In the holographic stereogram production apparatus, on the other hand, the hologram recording medium 3 needs to be intermittently sent by one element hologram during exposure recording as described below, but at this time, the hologram recording accompanying the intermittent transfer is performed. Tolerance of the inclination of the medium 3, that is, the angular precision of the recording medium 3 for the hologram, needs to be made quite high, which is not preferable in practice.

In addition, as another method for reducing the influence of the birefringence of the base film 4 and the cover film 6 on the recording medium 3 for the hologram, the cover film 6 is formed of a material having a low birefringence. It is considered to replace the thing. However, also in this method, the same problem arises with respect to the interference of the object light O and the reference light R, and it is not profitable.

Therefore, the present applicant, when the reference light (R) is incident on the hologram recording medium 3 in a linearly polarized light, the reference light (R) and the object that has passed through the base film (4) to reach the photopolymer layer (5) Reverse correction was performed by changing the polarization state of the reference light R in advance so that the coherence with the light O was the highest.

That is, as shown in FIG. 5A, the vibration direction of the light wave is changed, if the polarization plane of the reference light R of linearly polarized light incident on the recording medium 3 for hologram is changed, the vibration direction of the light wave is shown in FIG. 5B. As shown, the polarization plane of the reference light R of the elliptical polarization that has passed through the base pile 4 and reaches the photopolymer layer 5 also changes. Here, the object light (O) peels off the cover film (6) from the hologram recording medium (3), as shown in the vibration direction of the light wave in FIG. Incident on the medium 3. Therefore, the vector showing the polarization plane in the long axis direction of the elliptical polarization in the reference light R reaching the photopolymer layer 5 and the linearly polarized light in the object light O reaching the photopolymer layer 5. When the product with the vector representing the polarization plane of X is maximized, that is, the long axis direction of the elliptical polarization in the reference light R on the photopolymer layer 5 and the direction of the linearly polarized light in the object light O This coincidence becomes the most coherent, the contrast of the interference arc exposed and recorded on the photopolymer layer 5 can be made the highest, and a bright holographic stereogram image can be obtained.

As a method of performing such a reverse correction, the configuration of a reverse correction system as shown in FIG. 6 is considered. The inverse correction system transmits the half-wave plate 11, which is a polarization state variable means for rotating the polarization plane of the reference light R of linearly polarized light incident on the recording medium 3 for hologram, and the recording medium 3 for hologram. Of the birefringent reference light R, the intensity of the polarizing plate 12 which is an optical element in the polarization state detection means that transmits only a component having a predetermined polarization plane, and the reference light R transmitted through the polarizing plate 12 The photodetector 13 which is intensity detection means in the polarization state detection means to detect is provided.

As shown in FIG. 6, the reverse correction system has a half wave plate 11 arranged on the optical axis of the polarization plane of the reference light R having a polarization state of linearly polarized light. 6, the reference light R in which the polarization plane is rotated by a predetermined angle is incident on the recording medium 3 for the hologram, as indicated by the arrow d in FIG. In addition, the reverse correction system guides the birefringent reference light R through the partial region of the recording medium 3 for hologram with the polarizing plate 12. The polarizing plate 12 is provided so that the transmittance is minimum or maximum when the reference light R has the same polarization plane as the object light not shown here. Instead of the polarizing plate 12, the reverse correction system may be provided with an optical element such as a polarizing beam splitter exhibiting the same function. The inverse compensation system detects the intensity of the reference light R transmitted through the polarizing plate 12 by the photodetector 13. That is, the inverse correction system detects the polarization state of the reference light R by the polarizing plate 12 and the photo detector 13. The inverse correction system determines the rotation angle of the half-wave plate 11 so that the intensity of the reference light R detected by the photodetector 13 is minimum or maximum.

With this configuration, the reverse correction system can perform reverse correction by tilting the polarization plane of the reference light R so that the coherence between the reference light R reaching the photopolymer layer 5 and the object light is the highest.

The holographic stereogram production apparatus produces a holographic stereogram in which a bright holographic stereogram image is reproduced by applying such an inverse correction system when producing a holographic stereogram. Hereinafter, the holographic stereogram production apparatus will be described. Here, the holographic stereogram manufacturing apparatus is described by producing a holographic stereogram having transverse parallax information by exposing and recording a plurality of elementary holograms in the form of a single sheet onto a recording medium for holograms. As a gram making apparatus, a holographic stereogram having transverse and longitudinal parallax information may be produced by exposing and recording a plurality of urea-shaped holograms on one hologram recording medium.

For example, as shown in FIG. 7, the holographic stereogram production apparatus 20 exposes and records a holographic stereogram image on the hologram recording medium 3 made of the above-described photosensitive film. The holographic stereogram production apparatus 20 includes an image data processing unit 21 for processing image data of an exposure recording target, a control computer 22 for collectively controlling the holographic stereogram production apparatus 20; And a feedback control device 23 for performing feedback control, which will be described later, and a holographic stereogram production unit 24, which is an exposure recording means having an optical system for producing a holographic stereogram.

The image data processing unit 21 has at least an image processing computer 25 and a storage device 26, and for example, a parallax image thermal imaging device 1 having a multi-eye camera, a mobile camera, or the like. Parallax image data sequence based on image data such as photographed image data D1 including parallax information supplied from the computer image data D2 including parallax information generated by the computer 2 for image data generation (D3) is generated.

Also, the captured image data D1 is a plurality of image data obtained by, for example, simultaneous shooting with a multi-eye camera or continuous shooting with a mobile camera, and the time difference between each image data constituting the captured image data D1. Information is included. The computer image data D2 is a plurality of image data created as, for example, Computer Aided Design (CAD) or Computer Graphics (CG), and parallax information is included between each image data constituting the computer image data D2. .

The image data processing unit 21 uses the computer 25 for image processing to perform a holographic stereoscopic operation on the parallax image data string D3 on the basis of these photographed image data D1 and / or computer image data D2. The predetermined image processing for the gram is performed to generate the hologram image data D4. The hologram image data D4 is temporarily stored, for example, in a storage device 26 such as a memory or a hard disk device. As described later, the image data processing unit 21 performs an exposure recording of the element hologram image on the recording medium 3 for hologram from the hologram image data D4 stored in the storage device 26 for every one image. Element hologram image data D5 is read out sequentially, and these element hologram image data D5 are supplied to the control computer 22. As shown in FIG.

The controlling computer 22 controls the holographic stereogram production unit 24 to display the element display image based on the element hologram image data D5 supplied from the image data processing unit 21 and the holographic stereogram production unit 24. The holographic recording medium 3 provided in a part of the C) is sequentially exposed to light by means of a single element hologram. At this time, the control computer 22 controls the operation of each mechanism of the holographic stereogram production unit 24 as described later. In particular, the control computer 22 rotates the half-wave plate 11 in the holographic stereogram production unit 24 on the basis of the feedback signal C1 supplied from the feedback control device 23 as described later. The angle is determined, and the polarization plane of the reference light L3 is controlled.

As described later, the feedback control device 23 receives the feedback signal C1 for controlling the rotation angle of the half-wave plate 11 based on the intensity signal of the reference light supplied from the holographic stereogram manufacturing unit 24. Create The feedback control device 23 supplies the generated feedback signal C1 to the control computer 22.

The holographic stereogram control unit 24 is constructed by supporting each member constituting the optical system on a support substrate (optical plate) (not shown) and being supported by the device case through a damper or the like not shown. do. The holographic stereogram production unit 24 has an incident optical system, an object optical system, and a reference optical system as an optical system for producing a holographic stereogram. The holographic stereogram production apparatus 20 uses the hologram recording medium 3 as a photosensitive material, so that the device case body has a structure in which at least the light shielding property of the optical system is maintained.

As illustrated in FIG. 8A, the holographic stereogram manufacturing unit 24 is a laser light source 31 that emits laser light of a predetermined wavelength as an incident optical system, and a laser light L1 from the laser light source 31. A shutter mechanism 32 disposed on the optical axis of the laser beam L1 for incident or blocking the laser light L1 to the rear end, and a half mirror 33 for dividing the laser light L1 into the object light L2 and the reference light L3. Has

The laser light source 31 is composed of a laser device such as a semiconductor-excited YAG laser device, a water-cooled argon ion laser device, or a water-cooled Crabton laser device that emits a laser light L1 having a single wavelength and good coherence, for example. do. The laser light source 31 emits laser light L1 which is a straight line S polarization.

The shutter structure 32 is opened and closed by the control signal C2 output from the control computer 22 in response to the output timing of the element hologram image data D5, and the laser beam L1 is incident on the rear optical system. Let's do it. Alternatively, the incidence of the laser beam L1 into the optical system at the rear end is blocked.

The half mirror 33 divides the incident laser light L1 into transmitted light and reflected light. The laser beam L1 uses transmitted light as the object light L2 described above, while reflected light is used as the reference light L3. These object light L2 and reference light L3 are incident on the object optical system or the reference optical system provided at the rear stage, respectively.

In addition, although not shown in the incident optical system, a mirror or the like may be provided for the purpose of changing the advancing direction of the laser light L1 to make the optical path length between the object light L2 and the reference light L3 the same. good. The shutter structure 32 may be configured by, for example, mechanically driving the shutter piece or may be configured by an electronic shutter using an acoustic-optic modulator (AOM). That is, the shutter mechanism 32 should just be an opening-and-closing material which enables shielding and transmission of the laser beam L1.

8A and 8B, the holographic stereogram production unit 24 is a mirror 34, a special filter 35, a collimator lens 36, a projection lens 37, a cylinder as an object optical system. Optical components, such as the surgical lens 38 and the mask 39, are provided, and these optical components are sequentially arranged on the input axis along the optical axis.

The mirror 34 reflects the object light L2 transmitted through the half mirror 33. The object light L2 reflected by this mirror 34 is incident on the special filter 35.

The special filter 35 is formed by combining a convex lens and a pinhole, for example, and corresponds to the display surface width of the transmissive liquid crystal display 40 which describes the object light L2 reflected by the mirror 34 described later. Expand isotropically.

The collimator lens 36 converts the object light L2 enlarged by the special filter 35 into parallel light and guides it to the transmissive liquid crystal display 40.

The projection lens 37 enlarges the object light L2 slightly and projects it on the cylindrical lens 38. This projection lens 37 contributes to the improvement of the image quality of the produced holographic stereogram by slightly expanding the object light L2.

The physical lens 38 condenses the parallel-beamed object light L2 in the lateral direction.

The mask 39 has a single opening portion, and records the hologram for the cover film 6 in a state where the cover film 6 is peeled off from the object light L2 condensed by the physical lens 38. It enters into the medium 3.

In the object optical system, a transmissive liquid crystal display 40 is provided between the collimator lens 36 and the projection lens 37. The transmissive liquid crystal display 40 sequentially displays the element hologram images based on the element hologram image data D5 supplied from the control computer 22. In addition, the control computer 22 corresponds to the output timing of the element hologram image data D5, and supplies the drive signal C3 to the recording medium transfer mechanism 44 of the recording medium 3 for the hologram described later, By performing the operation control, the transfer operation of the hologram recording medium 3 is controlled.

In such an object optical system, the object light L2 which is divided into the incident optical system and enters a thin beam state and becomes linearly polarized light is enlarged by the special filter 35 and is incident on the collimator lens 36. It becomes parallel light. Further, in the object optical system, the object light L2 incident on the transmissive liquid crystal display 40 via the collimator lens 36 is image modulated in accordance with the element hologram image displayed on the transmissive liquid crystal display 40 and is projected. It enters into the cylindrical lens 38 via the lens 37. The object optical system causes the image-modulated object light L2 to enter the hologram recording medium 3 through the opening of the mask 39 while the shutter mechanism 32 is opened and closed, and responds to the element hologram image. This is recorded under exposure.

In addition, the holographic stereogram fabrication unit 24 has a half wavelength plate 11, a special filter 41, a collimator lens 42, and a mirror 43 as a reference optical system. It is arranged in sequence on the input side.

The half wave plate 11 is, for example, a mica wave plate constituting the above-described inverse compensation system, and the polarization plane of the reference light L3 that becomes the straight line S polarized light reflected and divided by the bottom mirror 43 is exemplified. For example, only a predetermined angle is rotated by rotating the optical axis. At this time, the half-wave plate 11 is rotated to have a high density and reproducibility by a rotating mechanism (not shown) by, for example, motor driving in accordance with the control signal C4 output from the control computer 22. This rotates only the predetermined angle of the polarization plane of the reference light L3.

Unlike the special filter 35 in the above-described object optical system, the special filter 41 is formed by combining a cylindrical lens and a slit, for example, and provides a polarized plane having a predetermined angle passing through the half-wave plate 11. The reference light L3 of the straight line S polarized light is enlarged in the one-dimensional direction corresponding to the predetermined width, specifically, the width of the display surface of the transmissive liquid crystal display 40.

The collimator lens 42 converts the reference light L3 enlarged by the special filter 41 into parallel light.

The mirror 43 reflects the reference light L3 and guides it to the rear of the recording medium 3 for hologram to enter it.

The holographic stereogram manufacturing unit 24 having such an optical system includes an object optical system that is an optical system through which the object light L2 divided by the half mirror 33 passes, a reference optical system that is an optical system through which the reference light L3 passes, and The optical path length of is almost the same. Therefore, the holographic stereogram production unit 24 can produce a holographic stereogram in which the coherence between the object light L2 and the reference light L3 is improved and a clearer reproduction image can be obtained.

The holographic stereogram manufacturing apparatus 20 further includes a recording medium transport mechanism 44 which intermittently transfers the hologram recording medium 3 in the direction indicated by arrow f in FIG. 8B and by one element hologram.

The recording medium transport mechanism 44 intermittently drives the hologram recording medium 3 on the basis of the drive signal C3 supplied from the control computer 22. The holographic stereogram production apparatus 20 operates the shutter mechanism 32 described above on the basis of the control signal 2C supplied from the control computer 22 in conjunction with the operation of the recording medium transport mechanism 44. Thus, the optical path of the laser light L1 is opened.

In addition, the holographic stereogram production apparatus 20 includes a polarizing plate 12 and a photo detector 13 constituting the above-described inverse correction system.

As described above, the polarizing plate 12 is provided so that the transmittance is minimum or maximum when the reference light L3 has the same polarization plane as the object light L2. The polarizing plate 12 transmits only a part having a predetermined polarization plane among the birefringent reference light L3 through the partial region of the hologram recording medium 3.

As described above, the photodetector 13 detects the intensity of the reference light L3 transmitted through the polarizing plate 12. The photodetector 13 supplies an intensity signal indicating the intensity of the detected reference light L3 to the feedback control device 23.

The holographic stereogram production apparatus 20 is supplied with a drive signal C3 corresponding to the one-element hologram from the control computer 22 to the recording medium transport mechanism 44 at the end of the exposure recording of the one-element image. As a result, the hologram recording medium 3 is driven and driven along the traveling path by an amount corresponding to the one-element hologram, and the unexposed portion is made to correspond to the opening of the mask 39 to stop. In addition, the holographic stereogram manufacturing apparatus 20 is configured such that the vibration generated in the hologram recording medium 3 is stopped quickly with the traveling operation of the hologram recording medium 3. Here, the hologram recording medium 3 is made of a photosensitive film in a mounted state, and is not shown, but is wound on a supply roll provided with a rotating material inside, for example, a film cartridge in which the whole is kept in a light shielding state. When the film cartridge is loaded into the holographic stereogram production apparatus 20, the recording medium for hologram 3 is continuously inserted into the holographic stereogram production apparatus 20, and the recording medium transfer mechanism 44 As a result, the driving path is driven by driving.

In this state, the holographic stereogram production apparatus 20 operates the shutter mechanism 32 to open the object light L2 and the reference light L3 which are image-modulated from the front and back surfaces of the recording medium 3 for the hologram. Incidentally, it enters into the hologram recording medium 3, and the interference call corresponding to the element hologram image is recorded under exposure. The holographic stereogram production apparatus 20 supplies the drive signal C3 to the recording medium transport mechanism 44 from the control computer 22 when the exposure recording of the one-element image is completed, and the recording medium 3 for the hologram. ) Is quickly driven by a predetermined amount to stop.

At this time, the holographic stereogram manufacturing apparatus 20 feeds back by the feedback control apparatus 23 so that the intensity of the reference light L3 detected by the port detector 13 may be minimum or maximum as described above. The signal C1 is generated and the half-wave plate 11 is rotated by the control signal C4 by the control computer 22 based on the control computer 22 based on the feedback signal C1. . The holographic stereogram production apparatus 20 does not normally need to perform feedback control as often as that for the rotation operation of the half-wave plate 11. That is, since the change of birefringence is usually not so rapid by the base film 4 in the hologram recording medium 3, the holographic stereogram production apparatus 20 is used to produce one holographic stereogram image. The feedback control may be performed for each exposure record or every exposure record of a plurality of holographic stereogram images.

For example, when the holographic stereogram production apparatus 20 finishes exposure recording of one holographic stereogram image, the holographic stereogram production apparatus 20 sets a mark for identifying a boundary with the holographic stereogram image that is subsequently exposed and recorded. Exposure is recorded separately at intervals, but feedback control can be performed accordingly.

The hologram stereogram production apparatus 20 uses, for example, exposure recording of a predetermined number of holographic stereogram images as one cycle, and sets the polarization state of the reference light L3 during the cycle period to the polarizing plate 12 and the photodetector ( 13) continue to detect, and the feedback control apparatus 23 calculates statistical information, such as the time average value of the intensity | strength of the reference light L3, and makes the half wave plate 11 rotate operation | movement based on this statistical information. You may also

The holographic stereogram manufacturing apparatus 20 differs in the number of times that it is necessary to perform the feedback control according to various factors such as the type of the hologram recording medium 3 and the nonuniformity of the quality. The feedback control may be performed at any time other than when the exposure recording of the holographic stereogram image is long, and the feedback control may be arbitrarily selected depending on the situation. For example, the holographic stereogram production apparatus 20 always displays the polarization state of the reference light L3 by the polarizing plate 12 and the photodetector 13 during exposure recording of at least one holographic stereogram image. When the detection is continued and the polarization state deviates from the predetermined polarization state, that is, when the intensity of the reference light L3 detected by the photodetector 13 becomes less than or equal to the predetermined value, the object light L2 and It is possible to determine that the interference with the reference light L3 is worse than the allowed state, and to perform the feedback control. At this time, the holographic stereogram production apparatus 20 calculates statistical information, such as the time average value of the intensity of the reference light L3 detected by the photodetector 13, by the feedback control apparatus 23, and the statistics Based on the information, the half wave plate 11 may be rotated.

The holographic stereogram production apparatus 20 may perform feedback control for each exposure recording of the element hologram. In this case, the holographic stereogram production apparatus 20 needs to irradiate the hologram recording medium 3 with the same laser light as the reference light L3 separately. Specifically, although not shown, the holographic stereogram manufacturing apparatus 20 diverges the reference light L3 transmitted through at least the half-wave plate 11 and the holographic stereogram in the hologram recording medium 3. Irradiation is considered so as to pass through an area other than the recording area of the image. The laser beam irradiated to the hologram recording medium 3 separately from the reference light L3 needs to be the same as the reference light L3. It should be noted that all conditions such as the angle of incidence to the medium 3 are in agreement with each other.

In the holographic stereogram manufacturing apparatus 20 according to the present invention, while the shutter mechanism 32 is opened and the object light L2 and the reference light L3 are irradiated to the hologram recording medium 3, that is, The shutter mechanism 32 is blocked while the element hologram or the holographic stereogram image is exposed and recorded, and the shutter mechanism 32 is cut off so that the object light l2 is applied to the recording medium 3 for the hologram. And the half-wave plate 11 is rotated in a state where the reference light 13 is not irradiated.

In this manner, the holographic stereogram production apparatus 20 in which the holographic stereogram image is exposed and recorded is further subjected to ultraviolet irradiation of the hologram recording medium 3 and holographic recording by a fixing unit (not shown). A fixing process which is a heating process at a predetermined temperature with respect to the medium 3 is performed, and the holographic stereogram image recorded with exposure is fixed to the recording medium 3 for hologram. The holographic stereogram production apparatus 20 sequentially cuts out the hologram recording medium 3 subjected to the fixing process to a predetermined size for each holographic stereogram image, and discharges it to the outside as one holographic stereogram. .

The holographic stereogram production apparatus 20 performs the following operations sequentially, thereby sequentially recording and recording a plurality of holographic stereogram images to the hologram recording medium 3 of the mounting type, and to one holographic stereo. A holographic stereogram in which a gram image is exposed and recorded is produced.

As described above, the holographic stereogram production apparatus 20 includes a cover film which makes the object light L2 and the reference light L3 together be linearly polarized and covers one main surface of the recording medium 3 for hologram ( 6) When the object light L2 is incident in the state of being peeled off, and the reference light L3 is incident on the recording medium 3 for hologram coated on the other main surface by the base film 4, the reference light ( Inverse correction is performed by tilting the polarization plane of the reference light L3 so that the interference between L3) and the object light L2 is the highest, thereby solving the instability of the brightness of the holographic stereogram image due to birefringence, Holographic Stereogram A holographic stereogram in which an image is reproduced can be produced.

The holographic stereogram production apparatus 20 according to the present invention allows the reference light 3 to enter the cover film 6 while the base film 4 is removed from the recording medium 3 for the hologram. The object light L2 is incident on the hologram recording medium 3 covered by the cover, and the polarization plane of the object light L2 is tilted to perform reverse correction. However, for the following reasons, as described above, it is preferable to tilt the polarization plane of the reference light L3 to perform reverse correction.

First, the first reason is that the object light L2 is condensed on the hologram recording medium 3, as shown in Fig. 8B. That is, the object light L2 to be focused is a set of light waves having a plurality of traveling directions, and the angle of incidence of the hologram recording medium 3 is varied. The birefringence changes from time to time by the angle of incidence, and when the reverse correction is performed by tilting the polarization plane of the object light L2, the intensity of light waves having a certain traveling direction among the object light L2 to be focused is determined by the polarizing plate 12 and It becomes difficult to determine whether it is detected by the photodetector 13. Therefore, it becomes difficult for the holographic stereogram production apparatus 20 to detect the intensity of the object light L2 as a result. On the other hand, when the reverse correction is performed by tilting the polarization plane of the reference light L3, one of the reasons is that the reference light L3 is incident on the recording medium 3 for hologram as parallel light. It can be mentioned as.

The second reason is due to the presence of the transmissive liquid crystal display 40. That is, since the holographic stereogram manufacturing apparatus 20 is equipped with the transmissive liquid crystal display 40, as the half wave plate 11 for inclining the polarization plane of the object light L2, It can not be installed later. As described above, when the half wave plate 11 is provided at the rear end of the transmissive liquid crystal display 40, the special filter 35 is isotropically enlarged corresponding to the display surface width of the transmissive liquid crystal display 40. In order to rotate the polarization plane of the object light L2, a half-wave plate 11 of at least the display surface width of the transmissive liquid crystal display 40 is required, which is not practical. On the other hand, in the case of performing the reverse correction by tilting the polarization plane of the reference light L3, it is sufficient to prepare a half-wave plate 11 having a size covering the reference beam L3 in the form of a thin beam divided by the half mirror 33. This is one of the reasons.

As a third reason, as shown in Fig. 8A, while the reference light L3 is incident at a predetermined angle with respect to the periphery of the hologram recording medium 3, the object light L2 enters the hologram recording medium 3. It is based on incident from the front surface with respect to the main surface of the That is, the birefringence situation has a predetermined angle with respect to the main surface of the hologram recording medium 3 as compared with the object light L2 incident from the front of the main surface of the hologram recording medium 3. The incident reference light L3 changes in response to a change in the installation angle of the hologram recording medium 3. For this reason, the holographic stereogram production apparatus 20 is considered to be preferable to perform correction for the reference light L3 having a large change in birefringence.

For this reason, it is interpreted that the holographic stereogram production apparatus 20 is substantially meaningful to perform reverse correction by tilting the polarization plane of the reference light L3.

Next, as another method for reducing the influence of birefringence by the base film 4 and the cover film 6 on the recording medium 3 for the hologram and improving the coherence between the object light and the reference light, It proposes again other than the method by the reverse correction of the polarizing surface mentioned above.

This method utilizes the wavelength field function of the hologram recording medium 3 itself. That is, the present applicant has found that the hologram recording medium 3 itself has the property of rotating the polarization plane and changing the polarization state in the same manner as the wave plate. Therefore, the applicant of the present application, when the reference light (R) is incident on the hologram recording medium 3 in a linearly polarized light, the reference light (R) and the object transmitted through the base film (4) to reach the photopolymer layer (5) The reverse correction was performed by rotating the hologram recording medium 3 in the principal plane direction of the hologram recording medium 3 so that the interference with the light O was the highest. Here, if the hologram recording medium 3 maintains the polarization axis such as crystal or mica, for example, when the polarization axis coincides with the polarization plane of the reference light R, the reference light R incident by linearly polarized light is The linearly polarized light is maintained even when exiting from the hologram recording medium 3. In reality, the hologram recording medium 3 has a different property from crystals, mica, etc., and does not hold the polarization side, but high coherence can be obtained by the same effect.

That is, as shown in Fig. 9A, the rotation direction when the hologram recording medium 3 is seen from the front with respect to the main surface, and the vibration direction of the light wave is shown in Fig. 9B in accordance with the rotation of the recording medium 3 for the hologram. Similarly, the polarization plane and the ellipticity of the reference light R of the elliptical polarization that has passed through the base film 4 and reach the photopolymer layer 5 also change. Here, as the object light O shows the vibration direction of the light wave in Fig. 9C, the cover film 6 is peeled off from the recording medium 3 for the hologram, whereby It enters into the recording medium 3. Therefore, the vector showing the polarization plane in the long axis direction of the elliptical polarization in the reference light R reaching the photopolymer layer 5 and the linearly polarized light in the object light O reaching the photopolymer layer 5. In the case where the product with the vector representing the polarization plane of the peak becomes the maximum, that is, the long axis direction of the elliptical polarization in the reference light R on the photopolymer layer 5 and in the object light O When the directions of the linearly polarized light coincide, the most coherence becomes high, the contrast of the interference arc exposed and recorded on the photopolymer layer 5 can be made highest, and a bright holographic stereogram image can be obtained.

As a method of performing such a reverse correction, as shown in FIG. 10, the reference light R is considered to constitute a reverse correction system. The reverse correction system includes a predetermined polarized light among the recording medium rotating mechanism 51, which is a recording medium rotating means for rotating the recording medium 3 for holograms, and the reference light R that is birefringent through the recording medium 3 for holograms. Intensity detection means in polarization state detection means for detecting the intensity of polarizing plate 52 which is an optical element in polarization state detection means which transmits only the component which has a surface, and the reference light R which permeate | transmitted this polarizing plate 52 Equipped with photodetector 53.

Such an inverse correction system injects the reference light R having a polarization state of linearly polarized light to the hologram recording medium 3, as indicated by the arrow g in FIG. 10. In addition, the inverse correction system rotates the hologram recording medium 3 by the recording medium rotating mechanism 51 in the main surface direction of the recording medium 3 for hologram, and the arrow (h) in FIG. As shown in the vibration direction of the light wave, the polarization plane of the reference light R whose polarization state becomes elliptical polarization is rotated only by a predetermined angle, thereby changing the polarization state. In addition, the reverse correction system guides the birefringent reference light R to the polarizing plate 52 through the partial region of the hologram recording medium 3. Similar to the polarizing plate 12 described above, the polarizing plate 52 is provided so that the transmittance becomes minimum or maximum when the reference light R has the same polarizing plane as the object light not shown here. Instead of the polarizing plate 52, the reverse correction system may be provided with an optical element such as a polarizing beam splitter exhibiting the same function. The inverse correction system detects the intensity of the reference light R transmitted through the polarizing plate 52 by the photodetector 53. That is, the inverse correction system detects the polarization state of the reference light R by the polarizing plate 52 and the photo detector 53. The inverse correction system determines the rotation angle of the hologram recording medium 3 by the recording medium rotating mechanism 51 so that the intensity of the reference light R detected by the photodetector 53 is minimum or maximum.

By doing this, the inverse correction system rotates the hologram recording medium 3 so that the interference between the reference light R reaching the photopolymer layer 5 and the object light is the highest, thereby recording the hologram recording medium 3. The reverse correction can be performed by changing the polarization plane of the reference light R transmitted through) as close as possible to the linear S polarization.

Hereinafter, a holographic stereogram manufacturing apparatus to which such an inverse correction system is applied will be described. In addition, in the following description, the same code | symbol is attached | subjected about the same structure as the holographic stereogram production apparatus 20 mentioned above, and detailed description is abbreviate | omitted.

For example, as shown in FIG. 11, the holographic stereogram production apparatus 20A is the feedback control apparatus 23A which performs the feedback control mentioned later other than the image data processing part 21 and the control computer 22 mentioned above. And a holographic stereogram production section 24A which is an exposure recording means having an optical system for producing holographic stereograms.

As described above, the control computer 22 controls the holographic stereogram production unit 24A to holographically display the element display image based on the element hologram image data D5 supplied from the image data processing unit 21. The hologram recording medium 3 provided in a part of the stereogram production unit 24A is sequentially exposed and recorded as a single element hologram. In particular, the control computer 22 is a hologram recording medium 3 provided in the holographic stereogram manufacturing unit 24A based on the feedback signal C1 ₁ supplied from the feedback control device 23A, as will be described later. The angle of rotation of the crystal is determined, the operation of the recording medium rotating mechanism 51 in the holographic stereogram production unit 24A is controlled, and the polarization state of the reference light L3 is controlled.

As described below, the feedback control device 23A uses the feedback signal C1 for controlling the rotation angle of the hologram recording medium 3 based on the intensity signal of the reference light supplied from the holographic stereogram manufacturing unit 24A. ₁ ) The feedback control value 23A supplies the generated feedback signal C1 ₁ to the control computer 22.

As shown in Figs. 12A and 12B, the holographic stereogram production unit 24A is the same as the holographic stereogram production device 24 described above for the incident optical system and the object optical system, but the reference optical system is described above. The half wave plate 11 is configured to be removed.

The holographic stereogram production apparatus 20A includes a recording medium transfer mechanism 44 for intermittently feeding the hologram recording medium 3 by one element hologram in the direction indicated by arrow i in FIG. 12B.

The holographic stereogram manufacturing apparatus 20a is provided with the recording medium rotating mechanism 51, the polarizing plate 52, and the photodetector 53 which comprise the above-mentioned inverse correction system.

According to the control signal C4 output from the control computer 22, the recording medium rotating mechanism 51, for example, the main surface center portion of the hologram recording medium 3 is rotated in the main surface inward direction as the center of rotation. The hologram recording medium 3 is rotated only by a predetermined angle. In addition, the recording medium rotating mechanism 51 is not limited to the main surface center portion as the rotation center for rotating the hologram recording medium 3, and the positional alignment of the recording medium 3 for the hologram and the exposure portion is always taken. As long as it is a losing structure, any point in a main surface may be center of rotation.

Similar to the polarizing plate 12 described above, the polarizing plate 52 is provided so that the transmittance becomes minimum or maximum when the reference light L3 has the same polarizing plane as the object light L2. The polarizing plate 52 transmits only a portion having a predetermined polarization plane among the birefringent reference light L3 through a partial region of the recording medium 3 for hologram.

The photodetector 53 detects the intensity of the reference light L3 transmitted through the polarizing plate 52 in the same manner as the photodetector 13 described above. The photodetector 53 supplies an intensity signal indicating the intensity of the detected reference light L3 to the feedback control device 23A.

The holographic stereogram production apparatus 20A as described above is driven in the same manner as the holographic stereogram production apparatus 20 described above, corresponding to the one element hologram from the control computer 22 at the end of the exposure recording for the one element image. The signal C3 is supplied to the recording medium transport mechanism 44, thereby driving the hologram recording medium 3 along the travel path in an amount corresponding to the one-element hologram, and unexposed to the opening of the mask 39. Stop by matching the site. Here, the hologram recording medium 3 is, as described above, an exposure film of a mounting type wound on a supply roll provided with a rotating material inside the film cartridge, and the supply roll and the hologram recording medium 3 continuously inserted. The take-up roll which winds up and removes is hold | maintained by the recording medium rotating mechanism 51, and rotation operation is performed. At this time, in the holographic stereogram production apparatus 20A, the direction of the holographic stereogram image exposed and recorded with respect to the main surface of the hologram recording medium 3 is rotated by rotating the recording medium 3 for hologram. Since there is a possibility to be inclined differently than usual, the recording medium transfer mechanism 44 is suitable for intermittent transfer direction of the hologram recording medium 3 so that the holographic stereogram image is not interrupted from the recording medium 3 for hologram. Intermittent transfer is performed while correcting.

In this embodiment, the holographic stereogram production apparatus 20A is configured to open the shutter mechanism 32 so that the object light L2 and the reference light L3, which are image-modulated at the front and back surfaces thereof, with respect to the recording medium 3 for hologram. An interference call corresponding to the element hologram image is exposed and recorded by entering the hologram recording medium 3. The holographic stereogram production apparatus 20A supplies a drive signal C3 to the recording medium transport mechanism 44 from the control computer 22 when the exposure recording of one element image is completed, and the recording medium 3 for the hologram. ) Is quickly driven to stop by a predetermined amount.

At this time, the holographic stereogram manufacturing apparatus 20A feeds back by the feedback control apparatus 23A so that the intensity of the reference light L3 detected by the photodetector 53 becomes minimum or maximum as mentioned above. The signal C1 ₁ is generated, and the recording medium rotating mechanism 51 is operated by the control signal C4 by the control computer 22 based on the feedback signal C1 ₁ , and the recording medium for the hologram ( Rotate 3). As described above, the holographic stereogram production apparatus 20A performs feedback control for the rotation operation of the hologram recording medium 3 for each exposure recording of one holographic stereogram image or a plurality of holographic stereos. The polarization state continuously detected by the polarizing plate 52 and the photodetector 53 during the exposure recording of the at least one holographic stereogram image may be performed in a predetermined polarization state. In the case of deviation, feedback control may be performed, or any of the above-described methods may be used.

As described above, the holographic stereogram production apparatus 20A is a cover film which makes the object light L2 and the object light L3 linearly polarized together and covers one main surface of the recording medium 3 for the hologram. (6) while the object light (L2) is taken off while the other main surface is incident on the hologram recording medium (3) coated with the base film (4), and the reference light (L3) is incident. The reference light L3 transmitted through the hologram recording medium 3 by rotating the hologram recording medium 3 so that L3 is incident and the interference between the reference light L3 and the object light L2 is the highest. The reverse correction is performed by changing the polarization plane of the polarization plane so as to approach the linear S polarization as much as possible, thereby solving the instability of the brightness of the holographic stereogram image due to birefringence, and the holographic in which the bright holographic stereogram image is reproduced. Create a stereogram Can be.

In addition, it is preferable that the 20% of holographic stereogram production apparatuses perform reverse correction according to the intensity | strength of the reference light L3 for the reason mentioned in description of the holographic stereogram production apparatus 20. FIG.

By the way, in the above-described holographic stereogram production apparatuses 20 and 20A, the exposure is performed in a state where the cover film 6 covering one main surface on which the object light in the hologram recording medium 3 is incident is peeled off. There is a feeling that it is necessary to record and that the complexity of the process is not denied. In addition, in the above-described holographic stereogram production apparatuses 20 and 20A, the polarization plates 12 and 52 and the photodetectors 13 and 53 are used together, and the birefringence is transmitted through the hologram recording medium 3. Since the method of detecting the polarization state of the reference light is adopted, it is necessary to separately install such polarizing plates 12 and 52 and photodetectors 13 and 53 as part of the optical system. Therefore, as a method of solving these problems, it is not necessary to remove the cover film 6, and the interference between the reference light and the object light without providing the polarizing plates 12 and 52 and the photo detectors 13 and 53. A method of detecting the polarization plane of the reference light so as to have the highest sex is proposed.

In this technique, conditional exposure exposure recording is performed on the hologram recording medium 3 of one mounting type for each exposure recording of at least one holographic stereogram image to determine an optimal polarization plane of reference light. . In addition, this method can be applied to the reverse correction of the polarization plane of the reference light by rotating the half-wave plate 11 provided in the optical system or by rotating the hologram recording medium 3 as described above. . Here, the case where the half-wave plate 11 is provided in the optical system is explained now.

The holographic stereogram production apparatus to which this method is applied is first of the holographic stereogram production apparatus 20 shown in FIGS. 7A and 8B, and includes a polarizing plate 12, a photodetector 13, and a feedback control device 23. ) Is removed. Therefore, the same components as those of the holographic stereogram production apparatus 20 described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

First, the holographic stereogram manufacturing apparatus is conditionally calculated exposure for determining the rotation angle of the half-wave plate 11 when the film cartridge wound around the hologram recording medium 3 made of the photosensitive film of the mounting type is loaded. Record. This condition-exposure exposure recording causes, for example, an all-white image to be displayed on the transmissive liquid crystal display 40 as the element hologram image based on the element hologram image data D5 described above, and the rotation angle of the half wave plate 11 is displayed. A predetermined number of element holograms are exposed and recorded as the object light L2 using the laser beam transmitted through the transmissive liquid crystal display 40 above the predetermined angle. Conditional calculation exposure recording is performed by changing the rotation angle of the half-wave plate 11, and performing the conditional calculation of an element hologram showing a plurality of brightnesses according to the stepwise change of the rotation angle of the half-wave plate 11. It is to produce a holographic stereogram image.

Specifically, the holographic stereogram production apparatus performs conditional exposure exposure recording by passing through a series of steps shown in FIG.

First, as shown in the figure, the holographic stereogram production apparatus searches for an origin as a reference for the rotation angle of the half-wave plate 11 provided in the reference optical system in step S1. This origin may be any rotation angle, and when the half-wave plate 11 is provided at this origin, the rotation angle becomes “0 °”. When the holographic stereogram production apparatus searches for the origin of the half-wave plate 11, the image data processing unit 21 and the control computer 22 are placed in a standby state.

Subsequently, in step S2, the holographic stereogram production apparatus rotates the half-wave plate 11 on the basis of the control signal C4 output from the control computer 22 and sets it to a predetermined angle. For example, in the holographic stereogram production apparatus, it is desired to set the half-wave plate 11 to "-45 degrees". This has been experimentally confirmed that the polarization plane rotates by 180 ° when the half wave plate 11 is rotated 90 °. When the half wave plate 11 is rotated in the range of ± 45 ° from the origin, the optimum polarization plane is obtained. It is due to being detectable. Therefore, below, the explanation is given by setting the half-wave plate 11 to "-45 degrees".

Subsequently, in step S3, the holographic stereogram production apparatus enables the above-described recording medium transfer mechanism 44 to operate under the control of the control computer 22 and hold the hologram recording medium 3. After that, in step S4, the recording medium transport mechanism 44 is based on the drive signal C3 supplied from the control computer 22 for ejection of the recording medium 3 for hologram. This causes the hologram recording medium 3 to drive only a predetermined distance, for example 1 mm.

Subsequently, in step S5, the holographic stereogram production apparatus has a vibration waiting time sufficient to suppress the vibration of the half-wave plate 11 due to the rotation and the vibration of the hologram recording medium 3 due to the driving drive. Waiting until T 'has passed, for example, an all-white image is displayed on the transmissive liquid crystal display 40 as the element hologram image based on the element hologram image data D5 from the control computer 22.

In step S6, the holographic stereogram production apparatus opens and closes the above-described shutter mechanism 32 only once, based on the control signal C2 supplied from the production computer 22, and performs the element hologram. Write the exposure.

Subsequently, the holographic stereogram production apparatus performs N exposure exposure recording in step S7, that is, the rotation angle of the half-wave plate 11 set in step S2 is "-45 °". Then, it is judged whether or not N element holograms have been subjected to exposure recording.

Here, when N exposures are not recorded, the holographic stereogram production apparatus performs the processing in step S8 and transfers the recording medium on the basis of the drive signal C3 supplied from the control computer 22. The mechanism 44 drives only the predetermined pitch distance, for example, 0.2 mm, for the hologram recording medium 3.

Then, in step S9, the holographic stereogram production apparatus waits until the vibration waiting time T sufficient to suppress the driving of the hologram recording medium 3 by the driving drive is elapsed. In (S6), the following process is repeated.

In this way, when N exposure recording is performed, that is, when it is determined in step S7 that the exposure recording of the N element holograms is finished, the holographic stereogram production apparatus shifts the processing to step S10. do. In addition, "N" which is the number of times of exposure recording is the brightness of the N element holograms that the half-wavelength wave 11 is exposed and recorded under a certain angle, and the N number of times that the half-wave plate 11 is exposed and recorded under different angle conditions. The difference from the brightness of the element hologram is a value set to such an extent that the element hologram can be detected by image processing, visual inspection, and the like described later.

Subsequently, the holographic stereogram production apparatus determines whether or not the half-wave wave 11 is rotated Q times in step S10.

Here, when it is not rotated Q times, the holographic stereogram production apparatus finely forms the half-wave plate 11 in step S11 based on the control signal C4 output from the control computer 22. Only the predetermined pitch angle + P ° of engraving is rotated. In addition, since the half-wave plate 11 needs to be rotated by 90 ° as a whole as described above, for example, when the predetermined pitch angle + P ° is set to "1 °", it is discriminated in step S10. "Q", which is the number of times to perform, becomes "90". That is, the frequency Q is represented by "90 / P" using a predetermined pitch angle + P °.

In step S12, the holographic stereogram manufacturing apparatus determines the hologram recording medium 3 by the recording medium transport mechanism 44 based on the drive signal C3 supplied from the control computer 22. It is sufficient to suppress the vibration of the half-wave plate 11 due to the rotation and the vibration of the hologram recording medium 3 caused by the driving in step S13. After waiting until the vibration waiting time T 'elapses, the process after step S6 mentioned above is repeated.

Such processing is repeated, and as a result of the determination in step S10, when the Q rotation is performed, that is, the exposure recording of the N element holograms is performed Q times, the rotation angle of the half-wave plate 11 is determined in step S2. When the rotation angle " + 45 ° " rotated by " + 45 ° " is set in " -45 ° "

In step S14, the holographic stereogram production apparatus determines the hologram recording medium 3 by the recording medium transport mechanism 44 based on the drive signal C3 supplied from the control computer 22. Only the distance is driven to drive, and in step S15, the holding of the hologram recording medium 3 by the recording medium transporting mechanism 44 is released, and the series of processing ends.

The holographic stereogram production apparatus in which the holographic stereogram image composed of N x Q element holograms is exposed and recorded is further subjected to the above-described fixing process, and the holographic image recorded on the hologram recording medium 3 is exposed. Freeze the stereogram image. The holographic stereogram production apparatus sequentially cuts out the hologram recording medium 3 subjected to the fixing process to a predetermined size and discharges it to the outside as one holographic stereogram.

As shown in Fig. 14, the holographic stereogram produced by such condition-calculated exposure recording is obtained by continuously recording _Q holographic stereogram images HS ₁ , HS ₂ ,..., And HS _Q. . That is, the holographic stereogram is a holograph having a width of N × 0.2 mm, which is composed of N element holograms exposed and recorded in the state of rotation angle “-45 °” of the half-wave plate 11 set in step S2. N element holograms exposed and recorded in the state of rotation angle “(-45 + P) °” of the half-wave plate 11 set in step S11 before the graphic stereogram image HS ₁ and the second exposure recording. The rotation angle of the half-wave plate 11 set in step S11 in front of the holographic stereogram image (HS ₂ ,... Q) Holographic stereogram image (HS _Q ) having a width of N × 0.2 mm that consists of N element holograms exposed and recorded with ° = (-45 + P × 90 / P) ° = “+ 45 °”. This exposure is recorded continuously. These holographic stereogram images HS ₁ , HS ₂ ,..., And HS _Q are each non-images and have different brightnesses during reproduction.

The holographic stereogram production apparatus reproduces such holographic stereograms, and performs image processing using, for example, a photodetector (not shown), and the respective holographic stereogram images HS ₁ , HS ₂ ,... By comparing the luminance information of HS _Q ), it is possible to obtain the rotation angle of the half-wave plate 11 on which exposure recording is performed in the state where the interference between the object light and the reference light is the highest. And the holographic stereogram production apparatus sets the rotation angle which calculated | required the half wave plate 11, and produces arbitrary image holographic stereograms.

The holographic stereogram production apparatus performs at least one or more, for example, 100 exposure holographic stereogram images for each exposure recording of the holographic stereogram image, thereby performing the above-described condition calculation exposure recording. Without removing the cover film 6 and separately providing a polarizing plate and a photodetector in the optical system, a condition in which the polarization direction of the reference light L3 is optimized with respect to the orientation direction of the hologram recording medium 3 can be detected. And a holographic stereogram in which a bright holographic stereogram image is reproduced.

The holographic stereogram production apparatus according to the present invention does not display an all-white image on the transmissive liquid crystal display 40 as an element hologram image based on element hologram image data D5 when performing conditional calculation exposure recording. The exposure recording may be performed without displaying an image. That is, the holographic stereogram production apparatus compares the brightness of the holographic stereogram images HS ₁ , HS ₂ ,..., HS _Q according to the rotation angle of the half-wave plate 11 when performing the conditional exposure recording. For the sake of simplicity, it is desired to obtain a holographic stereogram image on the basis of a non-image having no substantial content, and any technique can be applied as long as this is achieved.

In the holographic stereogram production apparatus according to the present invention, a holographic stereogram image (HS ₁ , HS ₂ ,..., HS _Q is performed without performing image processing when obtaining an optimum rotation angle of the half-wave plate 11). If the brightness can be detected, visual confirmation may be made.

In addition, as a method of detecting the polarization state with such condition-exposure exposure recording, as described above, it is also applicable to the reverse correction of the polarization plane of the reference light by rotating the hologram recording medium 3. . In this case, first, the holographic stereogram production apparatus includes the polarizer 52, the photodetector 53, and the feedback control apparatus 23A removed from the holographic stereogram production apparatus 20A shown in FIGS. 11 and 12. It becomes a configuration. This holographic stereogram production apparatus firstly controls the rotation angle of the hologram recording medium 3 instead of controlling the rotation angle of the half wave plate 11 in the series of processes shown in FIG. The polarization state can be detected so as to have the highest interference with the object light.

In this case, however, the holographic stereogram production apparatus does not rotate the hologram recording medium 3 by 90 ° so as to rotate the half-wave plate 11 in the range of 90 °. It is to be noted that the hologram recording medium 3 needs to be rotated 180 degrees in its entirety. However, it is known that the holographic stereogram manufacturing apparatus can obtain all polarization states by actually rotating the hologram recording medium 3 in the range of the angle of the polarization axis of the hologram recording medium 3, According to the method of the recording medium 3 for the hologram, for example, it is sufficient to rotate the half-wave plate 11 in a range of about 20 degrees around a predetermined origin.

In the holographic stereogram production apparatus according to the present invention, a plurality of different directions in the main surface of the hologram recording medium 3 are rotated by rotating the hologram recording medium 3 when performing conditional exposure exposure recording. The holographic stereogram image of is subjected to exposure recording. Therefore, in the holographic stereogram production apparatus, the recording medium is transported each time the hologram recording medium 3 is rotated when performing the conditional exposure recording so that the holographic stereogram images to be recorded are not overlapped with each other. By means of the mechanism 44, it is necessary to properly correct the intermittent conveyance direction of the recording medium 3 for hologram.

As described above, in the holographic stereogram manufacturing apparatus to which the present invention is applied, the reverse correction is performed by tilting the polarization plane of the light incident on the recording medium for hologram in advance or rotating the recording medium for hologram using half wave plate. By doing this, the instability of the brightness of the holographic stereogram image can be eliminated. Therefore, the holographic stereogram production apparatus can produce a holographic stereogram in which a bright holographic stereogram image is reproduced.

In addition, this invention is not limited to the example mentioned above. For example, in the above-described example, it has been described as using a mica wave plate or the like as the half wave plate. However, when producing a color holographic stereogram, it is effective to use a Fresnel wave plate as the half wave plate. That is, since the holographic stereogram production apparatus according to the present invention requires a plurality of wavelengths of laser light when producing a color holographic stereogram, it is stable by using a Fresnel wave plate having less wavelength dependence. Create color graphics stereograms.

In the above-described example, the base film and the cover film of the recording medium for the hologram have been described as peeling off at least one group, and in the present invention, only at least one of these films has birefringence, As long as the film is a recording medium for holograms constructed using one that does not have birefringence, exposure recording may be performed without peeling off both films.

In addition, in the above-mentioned example, although the holographic stereogram manufacturing apparatus which applied two types of inverse correction systems independently was demonstrated, this invention can also apply combining these both, and by this, A more stable holographic stereogram can be produced. This is the same even when the method of detecting an optimal polarization state by performing conditional exposure recording is applied.

The present invention can also be applied to holograms that are not holographic stereograms. That is, in the above-described embodiment, the holographic stereogram has been described as produced by the holographic stereogram production apparatus. However, the present invention can be easily applied even when producing a hologram. In other words, the present invention can be applied as long as the image is subjected to exposure recording by incidence of light on a hologram recording medium made of a film having a birefringence.

As this application example, FIG. 15 shows the application of the present invention in the case of producing a replica of a hologram by a method called so-called contact radiation. In this method, the master 60, which is the original plate on which the holographic stereogram image or the hologram image is exposed, and the hologram recording medium 3 are brought into close contact with each other, and the reference light R is irradiated from the hologram recording medium 3 side. For the holographic stereogram image or the hologram which is exposed and recorded on the master 60 by interfering the reflected light F reflected by the master 60 with the reference light R by the reference light R The image is recorded on the hologram recording medium 3. At this time, the duplication apparatus for producing the duplication adheres the main surface to the main surface of the master 60 while the cover film 6 covering one main surface of the recording medium 3 for hologram is peeled off. The reference light R is incident on the hologram recording medium 3 covered with the base film 4 by the main surface of the convenience, and exposure recording is performed.

The copying apparatus applies the inverse correction system described above to rotate the polarization plane of the reference light R having a polarization state of linearly polarized light by a half-wave plate (not shown here), and the reference light R with only the predetermined angle rotated by the polarization plane. ) Is incident on the hologram recording medium 3. In addition, the copying apparatus guides the birefringent reference light R through the partial region of the recording medium 3 for hologram with the polarizing plate 61, and displays the intensity of the reference light R passing through the polarizing plate 61. It is detected by the detector 62. Then, the duplication apparatus determines the rotation angle of the half-wave plate so that the intensity of the reference light R detected by the photodetector 62 is minimum or maximum. In addition, the duplication apparatus only needs to detect the polarization state of the reference light R by the polarizing plate 61 and the photodetector 62, but this means that the polarization state of the reference light R before reflection by the master 60, It is almost preserve | saved even after reflection, because the polarization state of the reference light R and the polarization state of the reflected light F become substantially the same.

In addition, the copying apparatus can obtain the same effect by applying a reverse correction system for rotating the hologram recording medium 3 using a recording medium rotating mechanism not shown here, without using a half wave plate. .

In this way, the copying apparatus performs inverse correction so that the coherence between the reference light R and the reflected light F is the highest, thereby reducing the influence of the refractive index of the recording medium 3 for holograms, and thus a bright holographic stereo. A replica in which a gram image or a hologram image is reproduced can be produced.

In the case where the present invention is applied to a hologram instead of a holographic stereogram, and the method of detecting an optimal polarization state by performing conditional exposure exposure recording is applied, the above-mentioned transmissive liquid crystal display when producing a holographic stereogram For example, a mirror, a diffuser, or the like may be provided at the position at which the 40 is to be installed, that is, at the position at which the object to be exposed and recorded as a hologram image is placed. That is, in this case, for example, as shown in FIG. 16, instead of the holographic stereogram image composed of the N element holograms described above, Q hologram images composed of an area having a predetermined area such as a circle, etc. (HS ₁ , HS ₂ ,..., And HS _Q ) are sequentially exposed and recorded while varying the rotation angle of the half wave plate 11 or the hologram recording medium 3, thereby comparing the brightness to the optimum half wave plate 11 or The rotation angle of the hologram recording medium 3 can be obtained.

As such, it goes without saying that the present invention can be modified appropriately without departing from the spirit thereof.

The present invention provides an optimal coherence for producing holographic stereograms or holograms, avoiding the degradation of the coherence between the object light and the reference light due to the transmission of the object light and the reference light for the hologram recording medium having birefringence. , To remove the instability of the brightness of the holographic stereogram image or hologram image, and to produce a holographic stereogram or hologram in which a bright holographic stereogram image or a hologram image is reproduced.

Claims (96)

An image exposure recording apparatus for exposing and recording a holographic stereogram image or a hologram image on a recording medium for a hologram, Image exposure recording means for irradiating the holographic recording medium with an object light and a reference light to expose and record the holographic stereogram image or the holographic image; Polarization state detection means for detecting a polarization state of the laser beam transmitted through the hologram recording medium; The laser light incident on the hologram recording medium on the basis of the detection result by the polarization state detecting means so that the interference between the object light and the reference light on the recording layer in the hologram recording medium is the highest. And a polarization state varying means for changing the polarization state. The method of claim 1, And the polarization state varying means changes the polarization state by rotating the polarization plane of the laser light. The method of claim 2, And the polarization state varying means has a half-wave plate for rotating the polarization plane of the laser light. The method of claim 3, wherein And the polarization state varying means controls the polarization plane of the laser beam by rotating the half-wave plate based on the detection result by the polarization state detection means. The method of claim 1, The polarization state detecting means includes an optical element transmitting only a component having a predetermined polarization plane among the laser beams transmitted through the hologram recording medium, and an intensity detecting means for detecting the intensity of the laser beam passing through the optical element. An image exposure recording apparatus having a. The method of claim 5, And the optical element is a polarizing plate, and the intensity detecting means is a photo detector. The method of claim 1, And the laser light is irradiated to the hologram recording medium while at least one of the exposure materials and the support material covering both main surfaces of the hologram recording medium is peeled off. . The method of claim 1, And the polarization state varying means changes the polarization state of the reference light incident on the hologram recording medium based on the detection result by the polarization state detecting means. The method of claim 8, And the polarization state detecting means detects the polarization state of the reference light transmitted through the hologram recording medium. The method of claim 8, The exposure recording and recording means comprises: the object light and the object light and the recording medium for the hologram in a state in which the supporting material covering the main surface to which the object light is irradiated is peeled out of the supporting material covering both main surfaces of the recording medium for the hologram. And the reference light is irradiated. The method of claim 1, And the exposure recording means irradiates the object light and the reference light whose polarization state is linearly polarized to the recording medium for hologram. The method of claim 1, And the polarization state varying means changes the polarization state of the laser light while the object light and the reference light are not irradiated on the recording medium for the hologram. The method of claim 12, And the polarization state varying means changes the polarization state of the laser light for every one or more exposure recordings of the holographic stereogram image or the hologram image. The method of claim 12, The polarization state detecting means detects a polarization state of the laser light during a predetermined number of exposures of the holographic stereogram image or the hologram image; And the polarization state varying means changes the polarization state of the laser light based on statistical information of the detection result by the polarization state detecting means. The method of claim 12, The polarization state detecting means detects at least one polarization state of the laser light during exposure recording of the holographic stereogram image or the hologram image, And the polarization state varying means changes the polarization state of the laser light when the detection result by the polarization state detection means indicates a deviation from a predetermined polarization state. The method of claim 12, And the polarization state varying means changes the polarization state of the laser light for every exposure recording of the element hologram constituting the holographic stereogram image. The method of claim 1, Recording medium rotating means for rotating the hologram recording medium on the basis of the detection result by the polarization state detecting means so as to have the highest interference between the object light and the reference light on the recording layer in the hologram media; And an image exposure recording apparatus. An image exposure recording method for exposing and recording a holographic stereogram image or a recording medium for hologram, Detecting a polarization state of the laser beam transmitted through the hologram recording medium when the hologram recording medium is irradiated with laser light as object light and reference light, and when the holographic stereogram image or the hologram image is exposed and recorded. Polarization state detection process, The laser incident on the hologram recording medium on the basis of the detection result in the polarization state detecting step so that the interference between the object light and the reference light on the recording layer in the hologram recording medium is the highest. And a polarization state variable step of changing the polarization state of light. The method of claim 18, In the polarization state varying step, the polarization state of the laser light is rotated so that the polarization state is changed. The method of claim 19, In the polarization state variable step, the polarization plane of the laser light is rotated by a half wave plate. The method of claim 20, In the polarization state variable step, the half-wave plate is rotated on the basis of the detection result in the polarization state detection step, and the polarization plane of the laser light is controlled. The method of claim 18, In the polarization state detecting step, only a component having a predetermined polarization plane is transmitted by an optical element among the laser beams transmitted through the recording medium for hologram, and the intensity of the laser beam transmitted through the optical element is the intensity detecting means. The image exposure recording method, characterized in that it is detected by. The method of claim 22, A polarizing plate is used as the optical element, and a photo detector is used as the intensity detecting means. The method of claim 18, And said laser beam is irradiated to said hologram recording medium in a state in which at least one of said support members covering both main surfaces of said hologram recording medium is peeled off. The method of claim 18, And wherein the polarization state of the reference light incident on the hologram recording medium is changed on the basis of the detection result in the polarization state detection step. The method of claim 25, And in the polarization state detecting step, the polarization state of the reference light transmitted through the hologram recording medium is detected. The method of claim 25, The object light and the reference light are irradiated to the hologram recording medium in a state in which the support material covering the main surface to which object light is irradiated is peeled out of the support material covering both main surfaces of the recording medium for hologram. An image exposure recording method. The method of claim 18, And the object light and the reference light whose polarization state becomes linearly polarized light are irradiated to the recording medium for hologram. The method of claim 18, And wherein the polarization state of the laser light is changed in the state where the object light and the reference light are not irradiated with respect to the hologram recording medium. The method of claim 29, And wherein the polarization state of the laser light is changed for each of the exposure recordings of the holographic stereogram image or the hologram image. The method of claim 29, In the polarization state detecting step, a polarization state of the laser beam is detected during a predetermined number of exposures of the holographic stereogram image or the hologram image. And wherein the polarization state of the laser beam is changed based on statistical information of the detection result in the polarization state detection step. The method of claim 29, In the polarization state detecting step, the polarization state of the laser beam is detected during at least one holographic stereogram image or exposure recording of the hologram image, And the polarization state of the laser beam is changed when the detection result in the polarization state detection step is out of a predetermined polarization state. The method of claim 29, And the polarization state of the laser light is changed for each exposure recording of the element hologram constituting the holographic stereogram image. The method of claim 18, A recording medium rotating step of rotating the hologram recording medium based on the detection result in the polarization state detecting step so that the interference between the object light and the reference light on the recording layer in the hologram recording medium is the highest. An image exposure recording method comprising: a. An image exposure recording apparatus for exposing and recording a holographic stereogram image or a hologram image on a recording medium for a hologram, Exposure recording means for irradiating the holographic recording medium with an object light and a reference light to expose the holographic stereogram image or the hologram image; Polarization state detection means for detecting a polarization state of the laser beam transmitted through the hologram recording medium; Recording medium rotating means for rotating the hologram recording medium on the basis of the detection result by the polarization state detecting means so that the interference between the object light and the reference light on the recording layer in the hologram recording medium is the highest; And an image exposure recording apparatus. The method of claim 35, wherein And the recording medium rotating means rotates the hologram recording medium in the main surface direction of the hologram recording medium. The method of claim 35, wherein The polarization state detecting means includes an optical element transmitting only a component having a predetermined polarization plane among the laser beams transmitted through the hologram recording medium, and an intensity detecting means for detecting the intensity of the laser beam passing through the optical element. An image exposure recording apparatus having a. The method of claim 37, And the optical element is a polarizing plate, and the intensity detecting means is a photo detector. The method of claim 35, wherein And the exposure recording means irradiates the laser light to the hologram recording medium in a state in which at least one of the supporting materials covering both main surfaces of the recording medium for hologram is peeled off. . The method of claim 35, wherein And the polarization state detecting means detects the polarization state of the reference light transmitted through the hologram recording medium. The method of claim 35, wherein The exposure recording means includes: the object light and the object with respect to the recording medium for hologram in a state in which a supporting material covering both main surfaces of the recording medium for hologram is peeled off, the supporting material covering the main surface to which object light is irradiated. An image exposure recording apparatus, characterized by irradiating reference light. The method of claim 35, wherein And the exposure recording means irradiates the object light and the reference light whose polarization state becomes linearly polarized light to the recording medium for hologram. The method of claim 35, wherein And the recording medium rotating means rotates the hologram recording medium in a state in which the object light and the reference light are not irradiated with respect to the program recording medium. The method of claim 43, And the recording medium rotating means rotates the hologram recording medium for every one or a plurality of holographic stereogram images or exposure recordings of the hologram images. The method of claim 43, The polarization state detecting means detects a polarization state of the laser light during a predetermined number of exposures of the holographic stereogram image or the hologram image; And the recording medium rotating means rotates the hologram recording medium on the basis of the statistical information of the detection result by the polarization state detecting means. The method of claim 43, The polarization state detecting means detects a polarization state of the laser light during at least one or more of the holographic stereogram image or the exposure recording of the hologram image, And the recording medium rotating means rotates the hologram recording medium when the detection result by the polarization state detecting means is out of a predetermined polarization state. The method of claim 43, And the recording medium rotating means rotates the holographic recording medium for every exposure recording of the element hologram constituting the holographic stereogram image. An image exposure recording method of exposing and recording a holographic stereogram image or a hologram image on a recording medium for a hologram, The polarization state of the laser beam transmitted through the hologram recording medium is detected when the hologram recording medium is irradiated with laser light as object light and reference light, and when the holographic stereogram image or the hologram image is exposed and recorded. Polarization state detection process, And a recording medium rotating step of rotating the hologram recording medium based on the detection result in the polarization state detecting step so that the interference with the object light on the recording layer in the hologram recording medium is the highest. An image exposure recording method, characterized in that. The method of claim 48, In the recording medium rotating step, the holographic recording medium is rotated in the inner direction of the main surface of the recording medium for the hologram. The method of claim 35, wherein In the polarization state detecting step, only a component having a predetermined polarization plane is transmitted by an optical element among the laser beams transmitted through the recording medium for hologram, and the intensity of the laser beam transmitted through the optical element is the intensity detection means. The image exposure recording method, characterized in that it is detected by. 51. The method of claim 50, A polarizing plate is used as the optical element, and a photo detector is used as the intensity detecting means. The method of claim 48, And the laser light is irradiated to the hologram recording medium in a state in which at least one of the support materials covering both main surfaces of the recording medium for hologram is peeled off. The method of claim 48, And in the polarization state detection step, the polarization state of the reference light transmitted through the hologram recording medium is detected. The method of claim 48, The object light and the reference light are irradiated to the hologram recording medium in a state in which a supporting member covering both main surfaces of the recording medium for the hologram is peeled off while the support member covering the main surface to which the object light is irradiated is peeled off. An image exposure recording method. The method of claim 48, And the object light and the reference light whose polarization state is linearly polarized are irradiated to the recording medium for hologram. The method of claim 48, And wherein the hologram recording medium is rotated in the state in which the object light and the reference light are not irradiated with respect to the hologram recording medium. The method of claim 56, wherein And wherein the hologram recording medium is rotated for every one or more holographic stereograms or exposure recordings of the holographic image. The method of claim 56, wherein In the polarization state detecting step, a polarization state of the laser beam is detected during a predetermined number of exposures of the holographic stereogram image or the hologram image. And in the recording medium rotating step, the recording medium for the hologram is rotated based on statistical information of the detection result in the polarization state detecting step. The method of claim 56, wherein In the polarization state detecting step, the polarization state of the laser light is detected between at least one holographic stereogram image or exposure recording of the hologram image, And the recording medium rotating step is characterized in that the hologram recording medium is rotated when the detection result in the polarization state detecting step is out of a predetermined polarization state. The method of claim 56, wherein And in the recording medium rotating step, the holographic recording medium is rotated for every exposure recording for the element hologram constituting the holographic stereogram image. An image exposure recording apparatus for exposing and recording a hologram stereogram image or a hologram image on a recording medium for a hologram, Exposure recording means for irradiating the holographic recording medium with a laser light as object light and a reference light, and for exposing and recording the holographic stereogram image or the hologram image; And a polarization state varying means for changing the polarization state of the laser light incident on the recording medium for hologram, The exposure recording means is arranged such that, for every exposure recording of the holographic stereogram image or the hologram image, the interference between the object light and the reference light on the recording layer in the hologram recording medium is the highest. Conditional exposure recording for determining the polarization state of the laser light, wherein each time the polarization state is changed by the polarization state varying means, a plurality of conditional calculation holographic stereogram images or holographic images are exposed and recorded; The polarization state varying means is such that the polarization state of the laser light is obtained such that the coherence between the object light and the reference light detected based on the holographic stereogram image or the hologram image for a plurality of condition calculations is the highest. And changing the polarization state of the laser light. 62. The method of claim 61, The polarization state variable means is to change the polarization state having a half-wave plate for rotating the polarization plane of the laser light, The exposure recording means is the condition calculation exposure recording, in which the holographic stereogram image or the condition for one condition calculation is used every time the half-wave plate is gradually rotated by the polarization state variable means by only a predetermined small angle. An image exposure recording apparatus, wherein the holographic image is subjected to exposure recording. The method of claim 62, The exposure recording means records exposure conditions of the holographic stereogram image or the hologram image for a plurality of condition calculation according to the stepwise change of the rotation angle of the half-wave plate by the polarization state variable means as the condition calculation exposure recording. An image exposure recording apparatus, characterized in that. The method of claim 63, wherein The object state varying means is characterized in that the object light detected by performing image processing on the holographic stereogram image or the hologram image for condition calculation during exposure recording of the normal holographic stereogram image or the hologram image. And an angle of rotation of the half-wave plate so that the polarization state of the laser light is obtained so that the coherence with the reference light is the highest. The method of claim 64, wherein And the image processing is a comparison process of luminance information of each of the holographic stereogram image or the hologram image for condition calculation. The method of claim 63, wherein The polarization state varying means includes the object light detected by visually comparing the holographic stereogram image or the hologram image for conditional calculation during exposure recording of the normal holographic stereogram image or the hologram image. And an angle of rotation of the half-wave plate is set so that the polarization state of the laser light with the highest interference with the reference light is obtained. 62. The method of claim 61, And the exposure recording means records and records the holographic stereogram image or the hologram image based on the holographic stereogram image for condition calculation or the non-image having no substantial content as the hologram image. . 62. The method of claim 61, The exposure recording means is for exposing and recording a holographic stereogram image composed of a predetermined number of element holograms or a hologram image composed of an area having a predetermined area as the holographic stereogram image or the hologram image for condition calculation. An image exposure recording apparatus. 62. The method of claim 61, And the exposure recording means irradiates the laser light to the hologram recording medium without peeling off both of the supporting materials covering both main surfaces of the recording medium for the hologram. . An image exposure recording method of exposing and recording a holographic stereogram image or a hologram image on a recording medium for a hologram, For every at least one holographic stereogram image or the exposure recording of the holographic image, the hologram recording medium is irradiated with laser light as object light and reference light, and the object on the recording layer in the hologram recording medium is irradiated. In order to determine the polarization state of the laser beam having the highest coherence between the light and the reference light, a condition calculation for exposing and recording a holographic stereogram image or a hologram image for a plurality of condition calculations each time the polarization state is changed Exposure recording process, The polarization state of the laser beam is changed so that the polarization state of the laser beam having the highest coherence between the object light and the reference light detected based on the holographic stereogram image or the hologram image for a plurality of conditional calculations is obtained. And a step of varying polarization state. The method of claim 70, In the condition calculation exposure recording step, the holographic stereogram image or the condition for one condition calculation is changed every time the half-wave plate for rotating the polarization plane of the laser light is rotated by only a predetermined small angle to change the polarization state. An image exposure recording method, characterized in that a hologram image is recorded under exposure. The method of claim 71, wherein And the holographic stereogram image or the holographic image for conditional calculation according to the stepwise change of the rotation angle of the half-wave plate in the conditional calculation exposure recording step. The method of claim 72, In the polarization state varying step, the object light detected by image processing is performed on the holographic stereogram image or the hologram image for condition calculation during exposure recording of the normal holographic stereogram image or the hologram image. And the rotation angle of the half-wave plate is set so that the polarization state of the laser light having the highest interference with the reference light is obtained. The method of claim 73, And the luminance processing of the holographic stereogram image or the holographic image for condition calculation is performed as the image processing. The method of claim 72, In the polarization state varying step, at the time of exposure recording of the normal holographic stereogram image or the hologram image, the holographic stereogram image or the hologram image for condition calculation is compared with the object light detected by visual observation. And the rotation angle of the half-wave plate is provided so that the polarization state of the laser light with the highest interference with the reference light is obtained. The method of claim 70, In the conditional calculation exposure recording step, the holographic stereogram image or the hologram image based on a non-image having no substantial content is exposed and recorded as the holographic stereogram image or the hologram image for condition calculation. Exposure recording method. The method of claim 70, In the conditional calculation exposure recording step, the holographic stereogram image for the condition calculation or the holographic stereogram image composed of a predetermined number of element holograms or the hologram image composed of an area having a predetermined area is exposed and recorded. An image exposure recording method, characterized in that. The method of claim 70, In the conditional calculation exposure recording step, the laser beam is irradiated to the hologram recording medium in a state in which both of the supporting members covering both main surfaces of the hologram recording medium are not peeled off. Exposure recording method. An image exposure recording apparatus for exposing and recording a holographic stereogram image or a hologram image on a recording medium for a hologram, Exposure recording means for irradiating the holographic recording medium with an object beam and a reference light to expose and record the holographic stereogram image or the hologram image; A recording medium rotating means for rotating the recording medium for the hologram, The exposure recording means is characterized in that the interference between the object light and the reference light on the recording layer of the recording medium for the hologram is the highest for every exposure recording of the at least one holographic stereogram image or the hologram image. Conditional exposure recording for determining the polarization state of a laser beam, wherein the recording medium rotating means exposes and records a plurality of conditional holographic stereogram images or hologram images each time the recording medium for hologram is rotated. , The recording medium rotating means is configured to obtain a polarization state of the laser light having the highest interference between the object light and the reference light detected based on the holographic stereogram image or the hologram image for calculating a plurality of conditions. And rotating the hologram recording medium. The method of claim 79, The recording medium rotating means rotates the recording medium for hologram in the main surface inward direction of the recording medium for hologram, The exposure recording means is the conditionally calculated exposure recording, wherein the holographic stereogram image for one condition calculation is used whenever the recording medium rotating means rotates the hologram recording medium by a predetermined minute angle. Or exposing and recording the hologram image. The method of claim 80, The exposure recording means includes the holographic stereogram image or the hologram image for condition calculation according to the stepwise change of the rotation angle of the hologram recording medium by the recording medium rotating means as the condition calculation exposure recording. An image exposure recording apparatus, characterized by recording exposure. 82. The method of claim 81 wherein The recording medium rotating means detects the object light detected by performing image processing on the holographic stereogram image or the hologram image for condition calculation during exposure recording of the normal holographic stereogram image or the hologram image. And an angle of rotation of the hologram recording medium so as to obtain a polarization state of the laser light having the highest interference with the reference light. 83. The method of claim 82, And the image processing is a comparison process of luminance information of each of the holographic stereogram image or the hologram image for condition calculation. 82. The method of claim 81 wherein The recording medium rotating means includes the object light detected by visually comparing the holographic stereogram image or the hologram image for conditional calculation during exposure recording of the normal holographic stereogram image or the hologram image. And the rotation angle of the hologram recording medium is set so that the polarization state of the laser light having the highest interference with the reference light is obtained. The method of claim 79, The exposure recording means is an image exposure recording, wherein the exposure recording means records the holographic stereogram image or the hologram image based on a no-image having no substantial content as the holographic stereogram image or the hologram image for condition calculation. Device. The method of claim 79, The exposure recording means is for performing exposure recording of the holographic stereogram image or the hologram image composed of a predetermined number of element holograms or a holographic image composed of an area having a predetermined area as the holographic stereogram image or the hologram image for condition calculation. An image exposure recording apparatus. The method of claim 79, And the exposure recording means irradiates the laser light to the hologram recording medium without peeling both of the support members covering both main surfaces of the hologram recording medium. . An image exposure recording method of exposing and recording a holographic stereogram image or a hologram image on a recording medium for a hologram, For each of the at least one holographic stereogram image or the exposure recording of the hologram image, a laser beam is irradiated onto the recording medium for the holographic stereogram as object light and a reference light, and the recording layer in the recording medium for the hologram Exposure recording a plurality of conditionally calculated holographic stereogram images or hologram images each time the hologram recording medium is rotated in order to determine the polarization state of the laser beam having the highest interference between the object light and the reference light on the image. A condition-calculated exposure recording process The recording medium for the hologram is obtained such that a polarization state of the laser light having the highest interference between the object light and the reference light detected on the basis of the holographic stereogram image or the hologram image for calculating a plurality of conditions is obtained. And a recording medium rotating step of rotating the recording medium. 89. The method of claim 88 wherein In the above condition-calculated exposure recording step, each time the hologram recording medium is rotated stepwise by a predetermined minute angle into the main surface of the hologram recording medium, the holographic stereogram image for one condition calculation Or the holographic image is subjected to exposure recording. 91. The method of claim 89, In the conditional calculation exposure recording step, the image exposure recording method is characterized in that the holographic stereogram image or the holographic image for condition calculation according to the gradual change of the rotation angle of the hologram recording medium is recorded. . 91. The method of claim 90, In the recording medium rotating step, the object light detected by performing image processing on the holographic stereogram image or the hologram image for condition calculation during exposure recording of the normal holographic stereogram image or the hologram image. And the rotation angle of the hologram recording medium is set so that the polarization state of the laser light having the highest interference with the reference light is obtained. 92. The method of claim 91 wherein The image exposure recording method, characterized in that the comparison processing of the luminance information of each of the holographic stereogram image or the hologram image for condition calculation is performed. 91. The method of claim 90, In the recording medium rotating step, at the time of exposure recording of the normal holographic stereogram image or the hologram image, the holographic stereogram image or the hologram image for condition calculation is visually compared with the object light detected. And the rotation angle of the recording medium for hologram is set so that the polarization state of the laser light having the highest interference with the reference light is obtained. 89. The method of claim 88 wherein In the conditional calculation exposure recording step, the holographic stereogram image or the hologram image based on a non-image having no substantial content is exposed and recorded as the holographic stereogram image or the hologram image for condition calculation. Exposure recording method. 89. The method of claim 88 wherein In the conditional calculation exposure recording step, exposure recording is performed as the holographic stereogram image or the hologram image for condition calculation, which comprises a holographic stereogram image composed of a predetermined number of element holograms or a hologram image composed of an area having a predetermined area. The image exposure recording method, characterized in that. 89. The method of claim 88 wherein In the conditionally calculated exposure recording step, the laser beam is irradiated to the hologram recording medium in a state that both of the supporting materials covering both main surfaces of the hologram recording medium are not peeled off. How to record.